Summary
The replacement of winter wheat varieties has greatly contributed to yield improvement worldwide and the progress in enhancing yield has been enormously achieved in China. Two sets of data, production yield from the National Bureau of Statistics of China (http://www.stats.gov.cn/english/) and experimental yield from literature, were used in this study for (1) displaying the increasing patterns of production yield among different provinces from 1978 to 2018 in China (2) exploring the genetic gain in yield and yield relevant traits through the varieties replacement based on experimental yield from 1937 to 2016 in China (3) comparing the yield gap between experimental yield and production yield. The results showed that both the production and experimental yield showed significantly increase t
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